Security update from Blizzard

[Mehtomiel]

It appears there's been a break into Blizzard's files - compromised info is a concern for US players but paranoid EU ones may also want to change their passwords.

eu.blizzard.com/en-gb/securityupdate.html

EDIT: and for the truly paranoid among us - us.battle.net/support/en/article/battlenet-sms-protect provides yet another measure to keep your account safe.